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A preparation method of polytetrafluoroethylene@phenolic resin core-shell composite particles

A technology of polytetrafluoroethylene and composite particles, which is applied in the preparation of microspheres, microcapsule preparations, etc.

Active Publication Date: 2021-05-04
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, core-shell composite particles with polytetrafluoroethylene as the core have many limitations in the preparation process, experimental repeatability, and selection of shell materials.

Method used

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  • A preparation method of polytetrafluoroethylene@phenolic resin core-shell composite particles
  • A preparation method of polytetrafluoroethylene@phenolic resin core-shell composite particles
  • A preparation method of polytetrafluoroethylene@phenolic resin core-shell composite particles

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Example 1 A method for preparing polytetrafluoroethylene@phenolic resin core-shell composite particles, comprising the following steps:

[0030] (1) Mix 5 mL of polytetrafluoroethylene emulsion with a solid content of 60% and 58 mL of deionized water, and ultrasonically disperse for 10 minutes to prepare a polytetrafluoroethylene aqueous emulsion.

[0031] (2) Dissolve 0.03g of fluorine-containing surfactant in 10mL of deionized water, and disperse ultrasonically for 10min to obtain a surfactant dispersion.

[0032] (3) Mix the resorcinol aqueous solution with a mass concentration of 3.85%, the formaldehyde with a volume concentration of 5.66%, and the sodium hydroxide solution with a mass concentration of 0.3% in an equal volume ratio (10mL) to obtain a mixed solution.

[0033] (4) After mixing the polytetrafluoroethylene aqueous emulsion and the dispersion of the surfactant FC-134, after mechanically stirring for 30 minutes, inject the mixed solution into the constant...

Embodiment 2

[0043] Example 2 A method for preparing polytetrafluoroethylene@phenolic resin core-shell composite particles, comprising the following steps:

[0044] (1) Mix 3 mL of polytetrafluoroethylene emulsion with a solid content of 60% and 40 mL of deionized water, and ultrasonically disperse for 10 minutes to prepare a polytetrafluoroethylene aqueous emulsion.

[0045] (2) Dissolve 0.01 g of fluorine-containing surfactant in 10 mL of deionized water, and disperse ultrasonically for 10 min to obtain a surfactant dispersion.

[0046] (3) Mix the resorcinol aqueous solution with a mass concentration of 3.85%, the formaldehyde with a volume concentration of 5.66%, and the sodium hydroxide solution with a mass concentration of 0.3% in an equal volume ratio (10mL) to obtain a mixed solution.

[0047] (4) After mixing the polytetrafluoroethylene aqueous emulsion and the dispersion liquid of the surfactant, after mechanically stirring for 30 minutes, inject the mixed solution into the const...

Embodiment 3

[0049] Example 3 A method for preparing polytetrafluoroethylene@phenolic resin core-shell composite particles, comprising the following steps:

[0050] (1) Mix 5 mL of polytetrafluoroethylene emulsion with a solid content of 60% and 58 mL of deionized water, and ultrasonically disperse for 10 minutes to prepare a polytetrafluoroethylene aqueous emulsion.

[0051] (2) Dissolve 0.03g of fluorine-containing surfactant in 10mL of deionized water, and disperse ultrasonically for 10min to obtain a surfactant dispersion.

[0052] (3) Mix the resorcinol aqueous solution with a mass concentration of 3.85%, the formaldehyde with a volume concentration of 5.66%, and the sodium hydroxide solution with a mass concentration of 0.3% in an equal volume ratio (10mL) to obtain a mixed solution.

[0053] (4) After mixing the polytetrafluoroethylene aqueous emulsion and the dispersion liquid of the surfactant, after mechanically stirring for 30 minutes, inject the mixed solution into the constant...

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Abstract

The invention relates to a preparation method of polytetrafluoroethylene@phenolic resin core-shell composite particles, comprising the following steps: (1) mixing polytetrafluoroethylene emulsion with deionized water, and ultrasonically dispersing to obtain polytetrafluoroethylene aqueous emulsion; (2) mixing Dissolve the fluorine-containing surfactant in deionized water, and ultrasonically disperse to obtain a dispersion of the surfactant; (3) mix the resorcinol aqueous solution, formaldehyde and sodium hydroxide solution uniformly in an equal volume ratio to obtain a mixed solution; (4) mix After mixing polytetrafluoroethylene aqueous emulsion and surfactant dispersion liquid, inject the mixed liquid after mechanical stirring, stir and react at room temperature ~ 55 ℃ for 12 ~ 36 hours to obtain a reddish brown solution; (5) the reddish brown solution is freeze-dried to obtain nucleus PTFE@phenolic resin composite particles with shell structure. The invention uses a one-pot method to initiate polymerization on the surface of polytetrafluoroethylene particles to synthesize a phenolic resin shell layer. The core-shell morphology has a high coverage rate and good repeatability. It can be put into industrial large-scale production and greatly broadens the application of polytetrafluoroethylene. field.

Description

technical field [0001] The invention relates to the technical field of preparation of polymer materials with special morphology, in particular to a method for preparing polytetrafluoroethylene@phenolic resin core-shell composite particles. Background technique [0002] Polytetrafluoroethylene (PTFE) is widely used in lubricating additives, sealing materials, anti-corrosion In the fields of materials and coatings, it has become the main material in many modern industrial fields such as engineering, national defense technology and machinery manufacturing. However, due to the poor compatibility of PTFE with other materials, and the problems of low mechanical strength and poor wear resistance, the application has been greatly limited. Therefore, the surface modification of PTFE is an important prerequisite to ensure its high performance in various fields. Currently common modification methods include high-energy irradiation, sodium naphthalene treatment, surface grafting, etc....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/14B01J13/20C08L27/18C08L61/12C08G8/22
CPCB01J13/14B01J13/206C08G8/22C08L27/18C08L61/12
Inventor 王宏刚杨亚文任俊芳高贵陈生圣赵更锐王娜
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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